package com.candy.control;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet("/changeApplicationScope")
public class ChangeApplicationScopeServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//        获取ServletContext（Application）对象
        req.getServletContext().setAttribute("applicationName","applicationValue_old");
        req.getServletContext().setAttribute("applicationName","applicationValue_new");
        req.getServletContext().removeAttribute("applicationName");
    }
}
